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Note 11 - Net Income (Loss) Per Common Share - Anti-dilutive Securities Excluded From Computation (Details) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Anti-dilutive securities (in shares) | 0 | 3,851,182 | 0 | 0
Share-based Payment Arrangement, Option and Restricted Stock Awards [Member] |  |  |  |
Anti-dilutive securities (in shares) | 0 | 1,965,455 | 0 | 0
Warrant [Member] |  |  |  |
Anti-dilutive securities (in shares) | 0 | 1,885,727 | 0 | 0

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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